No transparent-panels in applet manager Cinnamon 20.3

[freewee]

 * Cinnamon version: Cinnamon 20.3
 * Attach log:       (/home/<username>/.xsession-errors)

Issue
Hi
I would be interested in using transparent-panels, in Cinnamon 20.3, but I try to install it with any method, it is located in /home/xx/.local/share/cinnamon/extensions, but I can't see it in the applet manager (even in download tabs). When putting it in /home/XX/.local/share/cinnamon/applets, I can see it in the applet manager, but it says it is incompatible with my version of Cinnamon!!!
What can I do?
Thank you

Steps to reproduce

Other information